Picture squished and cropped when capturing from Laserdisc

I'm trying to digitize some Laserdiscs, but have run into a problem.

I originally tried using an external USB capture card made by Diamond Multimedia, the VC500SE:


That yielded a fine picture, but I was never able to get the VC500SE to send a stereo signal to my computer, and it appears this device is not able to do that and was never designed to do so.

Here is what the very nice video captures from that card look like, however:

mpv-shot0002-VC500SE.jpg

mpv-shot0001-VC500SE.jpg


Owing to the lack of stereo sound, I switched to my trusty old Elgato external capture card, which does provide stereo sound:

Unfortunately, the capture I performed using that device yielded an image whose dimensions were wrong, with the picture being vertically squashed and the sides being cropped off:

mpv-shot0002-Elgato.jpg


mpv-shot0001-Elgato.jpg


I am not sure if I changed any of my OBS settings in between these two captures. I'm hoping I did, because then I would have some hope of solving this problem by changing those settings back.

This is what my video settings screen currently looks like:

OBS video settings.png


When I play a Laserdisc, my screen looks like this. As you can see, the 4:3 aspect ratio Laserdisc picture does not fit perfectly inside the red box:
OBS-playing-LD.jpg


It not fitting inside the red box probably isn't the issue, however, as that's how things looked when I performed the original capture using the VC500SE, and that yielded a perfectly fine, non-squashed image with the correct aspect ratio and nothing cropped off from the sides.

When I use my mouse pointer to grab the edges of that red square, I can change its size or move it around, but I can not make it conform to the aspect ratio of the picture.

Regarding the Elgato capture card, I believe it's not causing the incorrect aspect ratio and cropping, because I have on many occasions used this card to capture Laserdisc and VHS sources in MacOS, using Elgato's consumer-grade video capture application, and there was never any problem with the image being squashed.

For this current crop of Laserdisc captures, however, I want to use OBS Studio because it provides higher-quality captures with a higher bit rate. I'm doing this in Windows 10 because Elgato's Windows driver enables OBS Studio for Windows to get a signal from the Elgato hardware, something which OBS Studio for MacOS can not do, because Elgato does not provide a Mac driver that is separate and distinct from Elgato's Mac video capture application.

Here are my two most recent OBS Studio log files:

Current log file:


Previous log file:


Thank you in advance for any help you can provide!!!
 
Looking at one of those log files, I wonder if this might be related to my problem:

I manually set the resolution to 640 x 480, but later on in the log file, I see a resolution of 720 x 480 being listed.

I don't know where that 720 x 480 is coming from. If it's the source of my problem, how do I rectify it?

Thank you!
Screen Shot 2023-08-03 at 7.48.20 PM.png


Screen Shot 2023-08-03 at 7.49.07 PM.png
 

deFrisselle

Member
The 720 would be the signal coming in So, it's the capture software or driver Might be a setting there It could also be the resolution of the video on the laserdisc Seems odd that you can't snap the corners of the red bounding box of the input video to the canvas box
 
The 720 would be the signal coming in So, it's the capture software or driver Might be a setting there It could also be the resolution of the video on the laserdisc Seems odd that you can't snap the corners of the red bounding box of the input video to the canvas box

The Internet says Laserdiscs have a resolution of 560 x 360 pixels. I think my Elgato capture card is only designed to provide a 640 x 480, though? But the log files says the card is sending a 720 x 480 signal? Very peculiar.

How do I fix this?

Hmmm...
 

deFrisselle

Member
The Laserdisc resolution ratio is 1.55 and the card looks to be sending a resolution ratio to match that at just over 1.5
I'd change the base canvas to 720 x 480
 
The Laserdisc resolution ratio is 1.55 and the card looks to be sending a resolution ratio to match that at just over 1.5
I'd change the base canvas to 720 x 480
Thank you! I wound up changing a setting that allowed OBS to automatically match its capture resolution to the source, and that fixed my problem!

Interestingly, the Internet says Laserdisc resolution is actually 560 x 360, which yields an aspect ratio of 14:9 or 1.56:1.

720 x 480, meanwhile, equals an aspect ratio of 3:2 or 1.50:1.

Therefore, I might soon experiment with setting OBS to capture at the Laserdisc's true resolution of 560 x 360, for the sake of matching its aspect ratio exactly.
 
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